<!DOCTYPE html>
<html lang="zh-CN">
    <head>
        <meta charset="UTF-8" />
        <title>20_浮动-标准流</title>
    </head>
    <body>
        <!-- 标准流 根据元素显示模式 进行网页布局 -->
        <div>1</div>
        <div>2</div>
        <div>3</div>

        <span>4</span>
        <span>4</span>
        <span>4</span>
    </body>
</html>